C++ - Palindroom

#include <iostream>
using namespace std;

bool test_palindroom( char letter[], const int i );
bool stop_controle( char letter[], const int i );
void lees( char letter[], int *i );

int main()
{
	char letter[100];
	int i=0;
	
	cout << "Geef een woord: (typ stop om te stoppen)";
	lees(letter, &i);
	
	while ( !stop_controle(letter, i) )
	{
		test_palindroom( letter, i );
		lees (letter, &i);
	}
	
	cout << "Het programma is beëindigd." << endl;

}

void lees(char letter[], int *i)
{
	*i=0;
	
	letter[0] = cin.get();
	
	while (letter[*i] != '\n' && *i <= 100)
	{
		*i = *i+1;
		letter[*i]=cin.get();
	}
}

bool stop_controle( char letter[], const int i)
{
	if( i == 4 ) {
		char controle[4] = {'s','t','o','p'};
		
		for (int tel=0; tel <= i; tel++)
		{
			if (controle[tel] == letter [tel]) 
			{
				return true;
			}
			else
			{
				tel=4;
				return false;
			}
		}
	}
	else {
		return false;
	}
}

bool test_palindroom( char letter[], const int i)
{
	bool palindroom_controle = true; 
	
	for ( int j=0; j < i/2; j++)
	{
		if(letter[j] != letter [i - j - 1])
		{			
			palindroom_controle = false ;
			j= i ;			
		}
	}
	
	for(int k = 0 ; k < i ; k++)
	{
		cout << letter[k] ;
	}	
	
	if ( palindroom_controle )
	{
		cout << " is een palindroom" << endl; 
	}
	else
	{
		cout << " is geen palindroom" << endl;
	}
}

#include <iostream>
using namespace std;
 
bool test_palindroom( char letter[], const int i );
bool stop_controle( char letter[], const int i );
void lees( char letter[], int *i );
 
int main()
{
	char letter[100];
	int i=0;
 
	cout << "Geef een woord: (typ stop om te stoppen)";
	lees(letter, &i);
 
	while ( !stop_controle(letter, i) )
	{
		test_palindroom( letter, i );
		lees (letter, &i);
	}
 
	cout << "Het programma is beëindigd." << endl;
 
}
 
void lees(char letter[], int *i)
{
	*i=0;
 
	letter[0] = cin.get();
 
	while (letter[*i] != '\n' && *i <= 100)
	{
		*i = *i+1;
		letter[*i]=cin.get();
	}
}
 
bool stop_controle( char letter[], const int i)
{
	if( i == 4 ) {
		char controle[4] = {'s','t','o','p'};
 
		for (int tel=0; tel <= i; tel++)
		{
			if (controle[tel] == letter [tel]) 
			{
				return true;
			}
			else
			{
				tel=4;
				return false;
			}
		}
	}
	else {
		return false;
	}
}
 
bool test_palindroom( char letter[], const int i)
{
	bool palindroom_controle = true; 
 
	for ( int j=0; j < i/2; j++)
	{
		if(letter[j] != letter [i - j - 1])
		{			
			palindroom_controle = false ;
			j= i ;			
		}
	}
 
	for(int k = 0 ; k < i ; k++)
	{
		cout << letter[k] ;
	}	
 
	if ( palindroom_controle )
	{
		cout << " is een palindroom" << endl; 
	}
	else
	{
		cout << " is geen palindroom" << endl;
	}
}